如何在实体框架6中包含所有关系？

Question

Items = new ObservableCollection<CompanyContact>(
                        db.CompanyContacts
                        .Include(p => p.Facility)
                        .Include(p => p.Company)
                        .Include(p => p.Manager)
                        .OrderBy(s => s.Name)
                        .ToList<CompanyContact>()
                    );

有更优雅的方式来写吗？ 我想在表格中包含所有关系。 像IncludeAll这样的东西？ 谢谢！

Answer 1

EF没有包含所有导航属性的方法。 如果您需要急切加载所有这些内容，除了要为要加载的每个导航属性调用所有包含外，别无选择。 稍微优雅的解决方案可能是使用以下扩展方法之一：

public static class IQueryableExtensions
{
    public static IQueryable<TEntity> GetAllIncluding<TEntity>(this IQueryable<TEntity> queryable, params string[] includeProperties)
    {
        return includeProperties.Aggregate(queryable, (current, includeProperty) => current.Include(includeProperty));
    }

    public static IQueryable<TEntity> GetAllIncludingWithFunc<TEntity>(this IQueryable<TEntity> queryable, params Expression<Func<TEntity, object>>[] includeProperties)
    {
        return includeProperties.Aggregate(queryable, (current, includeProperty) => current.Include(includeProperty));
    }
}

例如，使用第一种方法，您的查询将如下所示：

db.CompanyContacts.GetAllIncluding("Facility","Company", "Manager").OrderBy(s => s.Name).ToList();